Pickup for magneto-optical recording medium
A magneto-optical recording and pickup technology, which is applied in the directions of magnetic recording, optical recording head, recording/reproducing by optical methods, etc., can solve the problems of magneto-optical media that cannot handle different recording/reproducing systems, and achieves improved quality, The effect of improving quality
Inactive Publication Date: 2005-04-27
SHARP KK
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Problems solved by technology
Therefore, there is a problem that a single optical pickup cannot handle magneto-optical media of different recording / reproducing systems
Method used
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[0069] Referring now to the accompanying drawings, preferred embodiments of the present invention are described below.
[0070] figure 1 is a side view of a configuration illustrating the construction of a pickup 51 for a magneto-optical recording medium according to the first embodiment of the present invention in a simplified manner. A pickup 51 (hereinafter simply referred to as a pickup) for a magneto-optical recording medium includes a light source 52, an objective lens 54, a light-splitting diffraction element 55, first and second polarizing / separating elements 56 and 57, first and second Two photodetectors 58 and 59, a first phase compensating element 60, a second phase compensating element 61, and a collimating lens 62. The light source 52 emits light. The objective lens 54 condenses the light emitted from the light source 52 onto an information recording surface of a magneto-optical recording medium 53 (commonly called a magneto-optical disk). The spectroscopic diffra...
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Abstract
A pickup for a magneto-optical recording medium is provided, which improves quality of reproduced signals by eliminating a phase difference between the polarizations and is capable of coping with magneto-optical recording media of different recording / reproducing systems. A return light beam of light reflected by a magneto-optical recording medium is polarized and separated into +- first-order diffracted lights through a light-branching diffraction element provided between a light source and an objective lens. The +- first-order diffracted lights are compensated for their phases through first and second phase compensation elements so that there is no phase difference between the polarizations, and are, further, polarized and separated through the first and second polarization / separation elements, and are received by first and second light detectors. Use of the first and second phase compensation elements having different phase compensation amounts makes it possible to cope with the magneto-optical recording media of different recording / reproducing systems.
Description
technical field [0001] The present invention relates to a pickup for a magneto-optical recording medium for recording information to and / or reproducing information from the magneto-optical recording medium. Background technique [0002] A well-known example of a recording medium for recording information by using a magneto-optical recording system may be a minidisc (abbreviated as MD) having a diameter of 64 mm for recording music information. In addition to MD, a recording medium using a magneto-optical recording system can be represented by an MO disk for an MO (Magneto-Optical) disk drive, which is an external storage unit of a computer. Different standard MO discs used today have different recording systems and different recording film structures. [0003] Various super-resolution techniques have been proposed for significantly improving the recording capability of magneto-optical recording / reproducing systems handling MD or MO disks. For example, there is a method cal...
Claims
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IPC IPC(8): G11B7/00G11B7/135G11B7/1353G11B7/1365G11B11/10G11B11/105
CPCG11B11/10597G11B7/1353G11B7/1365G11B11/10545G11B2007/0006
Inventor 上山徹男南功治三宅知之中田泰男
Owner SHARP KK